"of strong drink": pomace wine (made from grape husks steeped in water), after fermentation.
I might think he could buy (with the tithe money) a beast for his son's feast — it is, therefore, derived (that you may not, thus:) It is written here "rejoice," and, elsewhere (Ibid. 27:7) "rejoice." Just as there, with peace-offerings, so, here, with peace-offerings. — But (why not) just as there, burnt-offerings and peace-offerings, so, here, burnt-offerings and peace-offerings? For it is written (here) "and you shall eat … and you shall rejoice" — a rejoicing accompanied by eating, to exclude burnt-offerings, where there is no eating, (a burnt-offering being entirely burned).